.wrapper {
  display: grid;
  grid-template-columns: [col1-start] 9fr [col1-end] 10px [col2-start] 3fr [col2-end];
  grid-template-rows: auto;
}
.wrapper {
  display: grid;
  grid-template-columns: 9fr 1.875em 3fr;
  grid-template-rows: auto;
  grid-template-areas: "header header header" "content . sidebar" "footer footer footer";
}